Dear Mr. Smith,
Happy to wirte to you.
First, let me introduce myself. I'm Li Hua, an ordinary student of Xinhua School. To my honor, I was asked to act as a tourist guide for you on next weekend. According to the schedule, we'll have a wonderful trip not far from the school. Since you are new here, it's neccessary for you to become familiar with the surroundings as soon as possible.
We can meet at 8 o'oclock on the morning of Saturday at the school gate. Remember not to carry too many things. Just a bottle of water, some pieces of bread or other kinds of food, a cap or a pair of sunglasses. Oh, you'd better wear a paif of sports shoes.
Look forwad to seeing you. I believe we'll have a good day.
yours,
Li Hua